Songbird's Bridle

 is an item of equipment in Tyranny.

Background
A complex locking mechanism on the rear of this ornate helm keeps it fastened to Sirin's head. When the Archon of Song raises her voice, the gem at the brow flashes with crimson light - as if in warning. No matter how much you puzzle it out, you can't fathom how this gear was assembled or fastened in the first place, much less how to remove it.

Location

 * Worn by Sirin. Cannot be removed, only upgraded at the Forge (the Bridle is considered a Cloth item).

Bastard's Wound artifact upgrade

 * Inspect the formation in Cairn's Passage with Sirin in the party.
 * Next, decipher the Ancient Oldwalls parchment and hand it to Sirin.
 * Talk to her after traveling to different locations. If you are supportive of her, you'll gain Loyalty with her, and the Bridle becomes an artifact helm.